The first doses of the Moderna COVID-19 vaccine arrive Wednesday at Delta Ambulance in Waterville. A second booster injection is required 28 days later. Michael G. Seamans/Morning Sentinel

Chip Getchell administers the first dose of the Moderna COVID-19 vaccine Wednesday at Delta Ambulance in Waterville. A second booster injection is required 28 days later. Michael G. Seamans/Morning Sentinel

Chip Getchell administers the first dose of the Moderna COVID-19 vaccine Wednesday at Delta Ambulance in Waterville. A second booster injection is required 28 days later. Michael G. Seamans/Morning Sentinel

Chip Getchell administers the first dose of the Moderna COVID-19 vaccine to Mike Record, a paramedic at Delta Ambulance, on wednesday in Waterville. A second booster injection is required 28 days later. Michael G. Seamans/Morning Sentinel

Chip Getchell administers the first dose of the Moderna COVID-19 vaccine to Jessica Dorgai, a paramedic at Delta Ambulance in Waterville, on Wednesday morning. A second booster injection is required 28 days later. Michael G. Seamans/Morning Sentinel

Chip Getchell measures a dose of the Moderna COVID-19 vaccine Wednesday as he administers an initial dose to EMS staff at Delta Ambulance in Waterville. A second booster injection is required 28 days later. Michael G. Seamans/Morning Sentinel